<div class="navbar navbar-inverse navbar-fixed-top">
    <div class="navbar-inner">
      <div class="container">
        <button type="button" class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        <a class="brand" href="#">艾思</a>
        <div class="nav-collapse collapse">
          <ul class="nav">
            <li class="active"><a href="#">首页</a></li>
            <li><a href="#about">关于我们</a></li>
            <li><a href="#contact">联系我们</a></li>
            <li class="dropdown">
              <a href="javascript:void(0)" class="dropdown-toggle" data-toggle="dropdown">应用 <b class="caret"></b></a>
              <ul class="dropdown-menu">
                <li><a href="#">在线调试</a></li>
                <li><a href="#">画布</a></li>
                <li><a href="#">动画廊</a></li>
                <li class="divider"></li>
                <li class="nav-header"></li>
                <li><a href="#">聊天室</a></li>
                <li><a href="#">音乐</a></li>
              </ul>
            </li>
          </ul>
        </div><!--/.nav-collapse -->
        <form id="js-login" class="navbar-form pull-right hide">
            <h2 class="form-signin-heading">请登录</h2>
            <input type="text" class="input-block-level" placeholder="邮箱">
            <input type="password" class="input-block-level" placeholder="密码">
            <label class="checkbox">
              <input type="checkbox" value="remember-me">记住密码
            </label>
            <button class="btn btn-large btn-primary" type="submit">登陆</button>
          </form>
      </div>
    </div>
</div>
<div class="container">
  <section class="musics"></section>
</div>